Changes

==Geological Setting==

==Geological Setting==

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Guara_01.jpg|Figure 1. Simplified geological map of Paraná Basin in Rio Grande do Sul state, Brazil. (modified from Scherer & Lavina)<ref name=Scherer_et_Lavina_2005 />

Guara_01.jpg|{{figure number|1}}Simplified geological map of Paraná Basin in Rio Grande do Sul state, Brazil. (modified from Scherer & Lavina)<ref name=Scherer_et_Lavina_2005 />

Guara_02.jpg|Figure 2. Stratigraphic diagram of Paraná Basin. Fm. Taquarembó is the Guará Formation correlate in Uruguay<ref name=Milani_1997>Milani, E.J. (1997) Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana sul-ocidental. Unpublished Ph.D thesis, Universidade Federal do Rio Grande do Sul, Porto Alegre, 255p.</ref>

Guara_02.jpg|{{figure number|2}}Stratigraphic diagram of Paraná Basin. Fm. Taquarembó is the Guará Formation correlate in Uruguay<ref name=Milani_1997>Milani, E. J., 1997, Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana sul-ocidental: Unpublished Ph.D thesis, Universidade Federal do Rio Grande do Sul, Porto Alegre, 255p.</ref>

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It is exposed in western Rio Grande do Sul (Brazil), bounded on the northeast by a fault system NW-SE ([[:file:Guara_01.jpg|Figure 1]]); it extends to the north of Uruguay, where it is named as Batoví Member of Taquarembó Formation; and possibly to the east in Argentina, where is poorly known. In Rio Grande do Sul, it has discordant contacts with the overlying Botucatu Formation (Lower Cretaceous), and underlying Sanga do Cabral Formation (Lower Triassic) ([[:file:Guara_02.jpg|Figure 2]]).

The Guará Formation is exposed in western Rio Grande do Sul, Brazil, bounded on the northeast by a fault system northwest–southeast ([[:file:Guara_01.jpg|Figure 1]]); it extends to the north of Uruguay, where it is named as Batoví Member of Taquarembó Formation; and possibly to the east in Argentina, where is poorly known. In Rio Grande do Sul, it has discordant contacts with the overlying Botucatu Formation (Lower Cretaceous), and underlying Sanga do Cabral Formation (Lower Triassic; [[:file:Guara_02.jpg|Figure 2]]).

==Age==

==Age==

==Sedimentary Environments==

==Sedimentary Environments==

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Guara_03.jpg|Figure 3. Vertical log and section showing the fluvial facies of Guará Formation northern portion.

Guara_03.jpg|{{figure number|3}}Vertical log and section showing the fluvial facies of Guará Formation northern portion.

Guara_04.jpg|Figure 4. Vertical log of Guará Formation near the Brazil-Uruguay frontier, showning facies examples for the fluvio-eolian system.

Guara_04.jpg|{{figure number|4}}Vertical log of Guará Formation near the Brazil-Uruguay frontier, showing facies examples for the fluvio-eolian system.

Guara_05.jpg|right|thumb|Figure 5. Stratigraphic correlation of Botucatu and Guará Formation in western Rio Grande do Sul (Brazil). Note the absence of aeolian facies in the northern portion of Guará Formation.<ref name=Scherer_et_Lavona_2006>Scherer, C. M. S.; Lavina, E. L. C. 2006. Stratigraphic evolution of a fluvial-eolian succession: The example of the Upper Jurassic-Lower Cretaceous Guará and Botucatu formations, Paraná Basin, Southernmost Brazil. Gondwana Research, v. 9, n. 4, p. 475–484.</ref>

Guara_05.jpg|{{figure number|5}}Stratigraphic correlation of Botucatu and Guará Formation in western Rio Grande do Sul (Brazil). Note the absence of aeolian facies in the northern portion of Guará Formation.<ref name=Scherer_et_Lavona_2006>Scherer, C. M. S., and E. L. C. Lavina, 2006, Stratigraphic evolution of a fluvial-eolian succession: The example of the Upper Jurassic-Lower Cretaceous Guará and Botucatu formations, Paraná Basin, Southernmost Brazil: Gondwana Research, v. 9, no. 4, p. 475–484.</ref>

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